<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>随机笑话</title>
    <link rel="stylesheet" href="./demo10.css">
</head>
<body>
    <div class="container">
        <h1>好无聊的demo</h1>
        <div class="joke" id="joke">
            这是一个笑话，确实很好笑
        </div>
        <button class="btn" id="btn">点击</button>
    </div>
    <script src="./demo10.js"></script>
</body>
</html>